https://www.census.gov/library/visualizations/interactive/historical-apportionment-data-map.html Apr 26, 2021 This interactive tool enables users to view more than 10 decades of apportionment and population data. Apportionment is the process of distributing representatives (or seats) in the U.S. House of Representatives among the 50 states based on the apportionment population counts from the decennial census. The District of Columbia and Puerto Rico are not included. The apportionment population count for each state is not always the same as its resident population count. For more information, see Historical Perspective. United States Census Bureau
https://www.census.gov/popclock provides updated data from the United States Census Bureau.
https://history.house.gov/Institution/Origins-Development/Proportional-Representation explains the origins and development of this system established by the Constitution.
https://www.census.gov/quickfacts/fact/dashboard/US/PST045219 provides visual data from the United States Census Bureau in the form of a table, map, and chart.
https://www.census.gov/population/www/documentation/twps0027/tab02.txt Source: U.S. Bureau of the Census Internet Release date: June 15, 1998
https://www.census.gov/population/www/documentation/twps0027/tab01.txt Source: U.S. Bureau of the Census Internet Release date: June 15, 1998
https://www.census.gov/library/stories/2021/02/presidential-birth-states-and-places-with-names-of-presidents.html provides the counties, cities, towns and minor civil divisions that carry presidential names.
https://www.census.gov/library/visualizations/2000/dec/2000-apportionment-change.html provides a map showing the change to the number of Congressional seats for each state between apportionment based on the 1930 Census and apportionment based on the 2000 Census. Apportionment is the process of dividing the 435 memberships, or seats, in the House of Representatives among the 50 states. At the conclusion of each decennial census, the results are used to calculate the number of House memberships to which each state is entitled.
http://archive.nytimes.com/www.nytimes.com/interactive/2010/12/21/us/census-districts.html shares State congressional representation changes from 1920 to 2010 using an interactive map of the United States.
